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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0bb1cdd80820b952e10b397cc6d74f73772448ef1f0de70e7aca079630f7bf99' 
  AND token = 'V4Hly71+43K0uCAbxuWadg4Kp9fwufs+inRIB/VGtxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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