Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cd98c24783f6e9acc519503d88f1ac6ad9cfcfce9a0551944eca8cf9ff8117' 
  AND token = 'FjFlvS9IVDq5ehDKoUi4xOvqhR1t67kizQezuyy+ktE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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