SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1182d70013407915ea62f8c176e7a32b3e96e81933f31eb94054ffcc9f27d84' 
  AND token = 'L0n99bPBdxN7JjZt4zUVHVQjkA2hDN+1Fm0QJCJ5fU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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