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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae2fa8c6446e0d60d5645fd31449b24fd6e11cbd479e0109fd65d9e452107f0b' 
  AND token = 'B2cO9cJ6vk3K+6eqGot33z5zYVauK6wOF26n3y+0ixA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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