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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19c91caf446453aca47aa851c363f6f2fd4cce372c5c775193a6b5670adcec6a' 
  AND token = '1tbgkurgDJ/yM/3k5wowW9203jlxua3gwrRw4s7V0CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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