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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8cbb8987c3bf7753e7b7af4b267aac5258ca6a01f523928d645451583a5855d6' 
  AND token = 'f2F5RFnzyYQpAp96t/lImXrQwu8EWZpWrO97V2Rcr40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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