Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75eab7a721ef2c0f178c1579919ef335ea980d24ca330225f76929780e80c1e6' 
  AND token = 'tBvCFUePIiAnm79ARk43waa+pCKuFFeCVu91/zLSEuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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