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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c66d1db76a915cdbeb3bf76a51940a08248ddad9d518c162c16f2aae938bf212' 
  AND token = 'ewjT3wanpXCQ9LG5stAU8N92i6PM3w3vC9jLamFNFBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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