Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30ebc3e745b81f2f456f02dc9ea18c122a530fccdedc5ac6f9c8cfc977ca2d6' 
  AND token = '3BrSTy+BRMWPM0rZKE21Cry8KyAULFHq/Q9xp+ziwTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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