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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a04a603237a12042c6d0bdb22e9fe86a4342591c69be8d9595860020cc9a8e7d' 
  AND token = '6i57sr6YA52azrq/d0xfKUbr5mazw3ik74YVUFmeUNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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