Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636e7f2ff1d76f86e393723c20ac81253b47611e8c60fd621aa1d87b2b5d32ac' 
  AND token = '5kWCIRC9DsotdGrw3oBM39Jtb8VPcPQSjLQz60by0po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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