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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37132d39bceee1a6b3032b68672937b0bb4b99abad6a03fd39fafda15c55fe26' 
  AND token = 'ScL8s+081rq3TOnWbVjQToh49ktqPSoLFWT+WkFSO/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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