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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '037f5c8ed67f80d5aca7c950a5e17aa1dda6554cbec128a5027fc35b1b8b313f' 
  AND token = 'xyj8dTXcZN5GA6vSctCKGDSjjpX275Qs4EwX729PxwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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