Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1821a2c633a8931b393e53ed4a73295e5b12c9f2a655bf20323274b4a2f445fb' 
  AND token = '3rPIF5bDi8+zsiMTBm4vMXRrQeTOf9P/N5Q1lcT+VfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}