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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e287e9b95ff184b475c8930d6fba9f706d9a6d2fe8b768b1f454a7ae529ac727' 
  AND token = 'WFuImuEjK2DjziM08XAFb+s9fB2AW+YEU+m961nQvMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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