Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df00da9b2a5c2dafc06efdbb14931d2df2df9c48b12a26dd0ad02a66d30ff5a' 
  AND token = 'baSILsH0gzIgRV2nJIwftvIhe9Q2/0ajVWcV9vzGCeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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