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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6d24c77a7fde88bfee4214112508543889425138bfb90710b2dcec988e49933' 
  AND token = '+MaCwvHNn98HPYWFs5i408cuqrD58vF5JrWY2JERgSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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