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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd4d8c6dee3a34de1c29f2e6e071a9e992b48cf6bcd219e2b256b3f15836d06cf' 
  AND token = 'BetqDMT+1GTwnccrxy7RjhYFuUSaebsJpERcLm/agmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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