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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e4b945cee64e96f76aa599aa441e3b20cb3d49ec7fdc36b205300739f496c8f' 
  AND token = 'P+La38bElPoqtW3Wgq/363Fcdaef3OwL4pv2RriNmDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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