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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be3b507f3278733c6df7a0f4b26d37b0321b2d2235fc33aa0fc2a907b334919d' 
  AND token = 'AeeclK/Ba5uaykkdQNBi1mKT3QsECamiBt/7+IF2EM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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