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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '442f05e7c996e0988666d91d63428fbf040473a9c7c6df2d4759221ccec72a6e' 
  AND token = 'FJu/mQCludMpoJmC+zPcHmiFf5RP/FyjZ8UOqRcxsb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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