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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e0d9f8b1227727f525736a7ad5d4f27c87f22f25d50bb945dce801e3d806f94' 
  AND token = 'WdycAVh5wrvpUP6Fgnd/qgEQp0M8ILCRFpH5es/yvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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