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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea7e10cfe34c14f33279a92ac9284340b9776cfa2b84ce62d776f15713959e42' 
  AND token = 'aWUWlly2lBGQfQJp8qqoNTksTyY+nOREpwR9NGdMYxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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