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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebedda0787e4a92ed4149a51d36f8d302c3e2de5026100ffb2ec47e67c0c0a03' 
  AND token = 'vKXeaBiGyg6US341R3MqXgDCro3tZVTt53jgQRPCgcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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