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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c9d941282c213923e4f24bd3dce5dcd08b6e26acf701bf0b513af9680171172' 
  AND token = 'z218+W1nxTh+JJtOa7mmjH/H6x9kuZ8fbvnRH4322/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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