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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2dc6b1d6cbc67b3a52107b152e127b29cccba7c8fe7b73ca726c776b262620c' 
  AND token = 'PReaMNbxIouQbKF8ogvn8nLzQUoQzQXD9k9cGP0P9DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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