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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb034896fcebf6d9dfd2fcbc8968408a710848c5585a553c38fe69d66334acbb' 
  AND token = 'HR1Wdggw8bzR4t5c27GvS6KbK5g+pAE/gLw7Qe8gouc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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