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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a37818deb4d519aed957cf35a02da109449668292ab6b579709daa626cfe1ad' 
  AND token = 'Noka8KyaqPvof5GSlVw462piJkBgofvi/4wCePUbWsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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