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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cef3c552f32ff38b9e6f6fcb320b4cc7686121e48081a0ba41e592ea7031de2d' 
  AND token = 'gPl8Vxemvx3R98VXH17yaBS624x2vXhcw7Wr2FhW0Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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