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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f3190969860c5897d77df1d8112b7beeef0a08cd955dccb68d3cbc7b0a900b80' 
  AND token = 'ckKrghbIj8lwU8XqZ+rtuwdNvxsmKAC5wtLjJhWlJIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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