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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f4a30c6b8543ef213b141c278d1389a29c13124509f19f4057fe9f3bae0237a8' 
  AND token = 'sYY3g2YiRZucB/N1SFKZbpB8pJQj1skbpBQWiXHmrnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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