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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6c089a42a13c98d74ae0e8ad02a16d8cea8e97ee630f5be571852936f9f05de6' 
  AND token = 'hK4jz4MabHd4ELbEKqrd/Ron25+KzMrYk8R7RyZ4E/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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