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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a2a2823081e42fd3c10402a5d0d54e799949c9c1e9ae493c907c5e4a501536b2' 
  AND token = 'pUkgorhnG+1taaCCVltpOl4lWZIZt2NlaDVQNIy25rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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