Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dddc4d852e42ba34e80b51798e2a5e9c5cdb175d824b6a4e2291f4fe390c83' 
  AND token = 'nTYaDPOmMTLlML6fCNMOtPGTkdrvqT5k4wr+G5UaWD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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