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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '77d5e9163f6ec994263275d9be96e8efa621216a7e867313b1e8f9fe6f80568e' 
  AND token = '01jtC0vkiwNX+zcjFwAbuSpaQVyDLVC2ckk4138XbA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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