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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e339c3dc49d74a13d5af7f9adfea85592c77472822521134f23dd9c3daedbf5' 
  AND token = 'xehsPmKBiaG5YtKt+5Ai0ioyDxVqduFHvmdeeLrpUUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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