Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebfbb7859ae8f0c9fac40b3d867e2c47bde7e4fc351bc1a508881579b5ca7a8' 
  AND token = 'eso0/zIWAD1bCfSNjunSGlZ3lAO6TxawRwrOHVoT2Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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