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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '433aee1daa5e7439499578e98561fe8454a8c0d2d77202ab37ae37593869f9fc' 
  AND token = 'FtZ0h037k2FWsgPFPBr66OKvIAloJ2VDscdfHQXMDI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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