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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55692d2c9f9a8165f950d1d518d803685a3db0a4e85f8fa1047a60f0066fbbc9' 
  AND token = '7AEaHCxIrZfLAw2kcewBXUOR7F9kBInRz4hD1QiqOpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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