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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bf913db3515696a6d0b5f7ecb595b436ce59657a04fb4b33b5f61213a565c452' 
  AND token = 'itBc3MaXPWucPsVAhIKHrIiwiRhN+utalmaYU5mXZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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