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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c33c0943cbd7c072f79f5414252f1389b7a438b34331e7db6663c43b1bd2a23f' 
  AND token = 'zsYP4EoWAkSIxCZ/fE/6aju63Hzpva5SsCtkc5gqrF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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