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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eef042e4b983a20873db978a1e3e969dec6a863ebaf72333287d5c78f6fec8f6' 
  AND token = 'qS6L2Rhp9Sc5jK2NwdecPcFZjPQMjwvE+my9eRE5ChA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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