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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae4a10c2561aa6fafe0417b057539e0a5c6e76b6ae8e3ee38ad3c543ce0b39e9' 
  AND token = 'l0MZmPpEfRwFG2gcf6txRFSjMAquGM2HeYxCBBOR4K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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