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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ddba579c69f58c5d9bac80d7c225ae92a55c73da1783e7e43626a68f414a597' 
  AND token = 'Ni93c9OTOV6PIM5cNE1AWInadwY8Gqw6RWE67bMBEEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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