Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2628da100de216b6fddb406d6466370308828f92a4b47d283318b3a2fef02341' 
  AND token = 'simyE4RrovLjH3X4GY0/6Lm7AMPyALq1In5g8rDZ+wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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