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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ddb58d02d79a8d2eeb2cd3f37a4a66b0458fb43ebe7e39dff1a60133fc69889' 
  AND token = 'EnNIex9Q4efHIx+rRAWjy/ZDnb8hrfXwsf3BssTa+yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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