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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de0bdc58ac066d16a2f4eb76158afbd65cb92b51d53ec75c7958e00dac62b997' 
  AND token = '0vj+M+0mW7NqDXj1PUQVka5ZeG7znIE1gx5M8y20vVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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