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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34c87d4f479d487f78fc4f949091e1148861b6709100843fbf71703bfe60dcc9' 
  AND token = 'jwpGufbnD+KTzkj9oQiyabszlVThiz/VLivXI64ojAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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