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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0504697005b71fb96d66ff1ee86257adc1c1526c4a342527f2354f6bc936ec69' 
  AND token = 'jr8tI0Usu0sVYRQsVBXJb58TosDa6nHLrf7LG9C0Gcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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