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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '974ee886272b2231acbd4f6656bb861541b14888222d42949b29083f5576dfc4' 
  AND token = 'dlITeLEkwYq1ywM4ad8vN2KpoycMRpQOMDLJ74LCVrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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