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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a87bf0f7e424df5680e9998b3034d7fad012c6ad126f1fddde02afa29dc1867e' 
  AND token = 'wAFJn0t0J1D0D05mx0QYveX7JZ9OSLI5Dj1Mtt2dw/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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