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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fc0d7dcd1187556ab24d50b2cbd2847e708579a09e13cc8267ae2eec76feeaa' 
  AND token = 'CoUstuzM3ZvqV5os156ie8Y7r2wWJKvNJ1E3EAfa3yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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