Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3851ad351108495bb4803e924b630de88e743ad3cd6bd8dd005041f8f3cc4430' 
  AND token = 'HDMf7XffVF0ncXbUhRpD0vhB6QiaDbsjBLVQT8QscF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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