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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a86e096ca6aa3a1ae275545e5fc53af03e60747ef154868fe10fd15d552d8c14' 
  AND token = 'dFUj2lrxjCWi5HNzcMVVhfZCX+9QhjjEGuDQAT5UvvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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