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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79ae0870b698f64f7bc3998ed3f337b7a8383da207e76828efb06781705246ed' 
  AND token = 'yOToID8O+Oy+grwlgUEAu0g8u9l4E0EnBpjG45YDfDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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