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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9079602f4525017cf509d7dc097875d1ff5a6dea4f9c1dab091e41e0f563926' 
  AND token = 'w+/HXIXW4XdzkBk1ds0rePk0w2Snt7EJX3Kxsi36FWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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