Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45b66d992bd44ff633d5feca1e4d7e122dd76ddd05e255e30d260f26fa7b556' 
  AND token = 'Te6RfosiDmpInTJUK0uHuWDt2oCZClVP+FCA7kwZi4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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