SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ff416c988786bb40bcdefbe04108db9e3617c66d7a33c6b94bb8955137f163f7' 
  AND token = 'RX3spJ3ygLGwmI+6xKLlw5YsDHwMmmNgIFqhVIeejNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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