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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d4db5cbe90c65132b687dcd02c643ec1fb2c21e34eb24348306143db4c1f4bc' 
  AND token = '0pVBrGjIdq7JCf/c6JbPKTiGaA4z9h1iJeGFEB5EW1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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