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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca62f2943f1e774dfffd17949838990dac40715f9050f53a30d67e0ed02a2b67' 
  AND token = 'u3ARSp193s3g7H/7dCLZT05wAm/Zy4KHv/97epc+MI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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