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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b514248069d4eae7e4a1d44ba9cd427e58add907e608dd8362bfd0825ffcf34a' 
  AND token = '7ilsZXBYlpdrTQts2F78u2+xiWj4OXW30r8oxfnP2+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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